There’s been a huge spike in the production of zombie movies lately, and many of them seem to be inspired by war. Everything from 28 Days Later... to Zombie Strippers makes explicit reference to wartime, as did seminal 1968 zombie flick Night of the Living Dead. Is there really a connection between zombie movies and social unrest? We decided to do some research and find out. The result is a line graph showing the number of zombie movies coming out in the West each year since 1910, and there are definite spikes during certain years, which always seem to happen eerily close to historical events involving war or social upheaval.

Mostly we’ve focused on movies from the U.S. and Europe, and we’ve included mummies but not vampires and ghosts. It’s necessary to correct somewhat for the fact that more movies are being made as we get closer to the present, and (more importantly) there are better records of those movies with better tagging. So it’s easier to research movies with zombies in them if you’re looking at productions from the 1980s onward. In addition, there’s been a huge boom in indie and low-budget horror movies over the past ten years, and that undoubtedly accounts somewhat for the giant spike you see during the last 8 years or so.

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If you’re going to look at these historical correlations, you have to consider that movies inspired by a real-life event aren’t going to show up in theaters for at least six months to a year, so we’ve accounted for that. Still, even correcting for these factors, there are distinctive spikes in zombie popularity, and they always seem to fall slightly after a huge political or social event has caused mass fear, chaos, or suffering. World War II, Vietnam, and the current Iraq War are all followed by a zombie rush at theaters, as are other periods of trauma such as the AIDS epidemic. Is there a causal connection, or is it just coincidence? You be the judge.